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PDF RAA207705GBM Data sheet ( Hoja de datos )
| Número de pieza | RAA207705GBM | |
| Descripción | (RAA207703GBM - RAA207705GBM) Synchronous Buck Regulator | |
| Fabricantes | Renesas | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RAA207705GBM (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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Preliminary Datasheet
RAA207703GBM/7704GBM/7705GBM
Synchronous Buck Regulator with
Internal Power MOSFETs
R07DS0892EJ0001
Rev.0.01
Nov 29, 2012
Description
The RAA207703GBM is monolithic synchronous buck regulator with power MOSFETs in extremely small package.
The RAA207703GBM delivers high output current by small Rds(on) Power MOSFETs. Constant on time control
architecture provides fast transient response, and minimize external components. The RAA207703GBM operates skip
mode at light load, it provides high efficiency in all load condition. The RAA207703GBM incorporates internal 5V
LDO, so the regulator can operates single power supply. Three current ability products can be selected.
Features
Input voltage range: 5.5 V to 16 V
Constant-On-Time control
Built-in power MOSFETs suitable for PC, Server application
Internal 5 V LDO for single power supply operation
5 V LDO / external 5 V input selectable (LDO remote ON/OFF)
Switching frequency: Adjustable up to 2 MHz
High average output current, up to 15 A (7703GBM), 10 A (7704GBM), 5 A (7705GBM)
Controllable driver: Remote on/off
Power Good function
Over current protection/Over voltage protection/Thermal shutdown function
Built-in bootstrapping diode
Soft Start period adjustable
Enhanced light load mode function for higher efficiency
Extremely small chip size package with solder bump
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Pb-Free/Halogen-Free
Application Circuit
VIN
VCC
SET BOOT
V5_IN
VIN
ON/OFF
SS RAA207703GBM
RAA207704GBM SW
RAA207705GBM
PGOOD
LDO_EN#
SGND
FB
PGND
VOUT
R07DS0892EJ0001 Rev.0.01
Nov 29, 2012
Page 1 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
RAA207703GBM/7704GBM/7705GBM
Absolute Maximum Ratings
Item
Symbol
Ratings
Input voltage
VIN –0.3 to +20
Switch node voltage
SW
20(DC), 23(<10 ns)
BOOT voltage
VBOOT
25(DC), 28(<10 ns)
Controller voltage
VCC
–0.3 to +6
VCC current
ICC –20 to +0.1
V5_IN voltage
V5_IN
–0.3 to +6
FB pin voltage
ON/OFF voltage
LDO_EN# voltage
SET voltage
PGOOD voltage
PGOOD sink current
Operating junction temperature
VFB
VON/OFF
VLDO_EN#
VSET
VPGOOD
IPGOOD
Tj-opr
–0.3 to VCC +0.3
–0.3 to VIN
–0.3 to VIN
–0.3 to VIN
–0.3 to VIN
+2
–40 to +125
Storage temperature
Tstg
–55 to +150
Notes: 1. Rated voltages are relative to voltages on the SGND and PGND pins.
2. BOOT – VCIN < 20 V
3. For rated current, (+) indicates inflow to the chip and (–) indicates outflow.
4. VCC + 0.3 V < 6 V
Unit
V
V
V
V
mA
V
V
V
V
V
V
mA
°C
°C
Preliminary
(Ta = 25°C)
Notes
1
1
1, 2
1
3
1
1, 4
1
1
1
1
3
Recommended Operating Condition
Item
Input voltage
Controller voltage
Continuous output current
Symbol
VIN
VCC
IOUT
Ratings
5.5 to 16
4.5 to 5.5
0 to 15
0 to 10
0 to 5
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Unit
V
V
A
Remarks
When 5 V LDO use
Controller voltage is supplied externally
15 A: RAA207703GBM
10 A: RAA207704GBM
5 A: RAA207705GBM
R07DS0892EJ0001 Rev.0.01
Nov 29, 2012
Page 5 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
RAA207703GBM/7704GBM/7705GBM
Preliminary
Stability Criteria, Output Voltage Setting for High ESR Output Capacitor
Small output ripple voltage makes control loop unstable in constant on time architecture. Ripple voltage needs to be
larger than 15 mV on FB pin. When using high ESR (>50 m) capacitor such as Electrolytic capacitor, Polymer
aluminum capacitor for output capacitor, ripple voltage on FB pin will be more than 15 mV.
VIN
SW
FB
Lout
R1
Vout
ESR
R2 Cout
Stability criteria
From loop stability analysis, constant on time control system must satisfy below equation.
Stability criteria: ESR • Cout > ton / 2
Here, ton is constant on time. If the system cannot satisfy above equation, subharmonic oscillation will occur.
Vout setting
FB comparator compares FB voltage and internal accurate reference voltage (0.8 V). Feedback loop controls FB voltage
to match the reference voltage. Therefore, output voltage is set by following equation.
Vout: 0.8 V • (R1+R2) / R2
Here, R1 and R2 is output voltage divider resister (refer to above figure). However, ripple voltage on FB pin affects FB
voltage, so Vout slightly shifts from setting value. If the system needs high accuracy, adjust Vout by changing R1, R2
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value.
R07DS0892EJ0001 Rev.0.01
Nov 29, 2012
Page 11 of 17
Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet RAA207705GBM.PDF ] | |
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